Biochemical Engineering - Downstream Processing

Exercise :: Downstream Processing - Section 1

  • Downstream Processing - Section 1
21. 

For cost analysis in a fermentor system, the depreciation cost varies from

A. 5-6% of the capital cost
B. 6-7% of the capital cost
C. 6-10% of the capital cost
D. 8-10% of the capital cost

Answer: Option C

Explanation:

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22. 

Micro filtration refers to the separation of suspended material such as bacteria by using a membrane with spore sizes of

A. 0.02 to 10μm
B. 1-10A°
C. 20-30μm
D. 10-200A°

Answer: Option A

Explanation:

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23. 

Start up expenses in a fermentation industry varies from

A. 0-5% of the capital cost
B. 10-15% of the capital cost
C. 5-10% of the capital cost
D. 15-20% of the capital cost

Answer: Option C

Explanation:

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24. 

The solvent flux across the membrane can be expressed as (where A is the area, Lp is the membrane permeability, σ is the reflection point, Δp is applied pressure and Δπ is the osmotic pressure)

A. J = Lpp - σΔπ)
B. J/A = Lpp - σΔπ)
C. J = Lp/σΔπ
D. J/A = Lpp

Answer: Option A

Explanation:

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25. 

Which of the following is considered as a pretreatment to the biological feeds?

A. Heating to denature the proteins
B. Addition of filter aids to increase the porosity
C. Addition of electrolytes
D. All of the above

Answer: Option D

Explanation:

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